When editing a QML file, switching between visual editing and source code editing is possible and actually makes sense. When editing a ui-file, switching from visual editing to sourcecode-editing does not make sense because it switches to a read only view of the XML-file. It would make more sense if creator would switch to the appropriate CPP-file. I know that actually creator cannot know in which CPP-file the actual implementation of the form takes place and whether such a file exist at all. But if creator would add such meta information when creating a Qt Designer Form class, it would know and I would manually give edit those information for fast switching between visual editing (of the ui file) to sourcecode editing (of the cpp file).